You should read the following discussion and analysis of our financial condition
and results of operations together with our unaudited condensed financial
statements and related notes appearing elsewhere in this Quarterly Report on
Form 10-Q and
our audited financial statements and related notes included in our Annual Report
on Form
10-K
for the year ended December 31, 2020, or the 2020 Annual Report, that was filed
with the Securities and Exchange Commission, or SEC, on March 1, 2021. In
addition to historical information, this discussion and analysis contains
forward-looking statements that involve risks, uncertainties and assumptions.
Our actual results may differ materially from those anticipated in these
forward-looking statements as a result of certain factors. Among the important
factors that could cause actual results to differ materially from those
indicated by our forward-looking statements are those discussed under the
heading "Risk Factors" in Part II, Item 1A. and elsewhere in this report, and in
the 2020 Annual Report.
Objective
The purpose of this Management's Discussion and Analysis is to better allow our
investors to understand and view our company from our management's perspective.
We are providing an overview of our business and strategy, followed by a
discussion of our financial condition and results of operations. As further
discussed below, our vision is to continue building a leading messenger RNA, or
mRNA, product company, leveraging our extensive experience with proprietary mRNA
product development, delivery, manufacturing and process development. However,
we will need substantial additional funding to support our continuing operations
and pursue our growth strategy. We believe that our existing cash, cash
equivalents and investments will enable us to fund our operating expenses and
capital expenditure requirements through 2023.
Business Overview
We are a clinical-stage mRNA therapeutics company developing a new class of
potentially transformative medicines to treat diseases caused by protein or gene
dysfunction, or to prevent infectious diseases by generating protective
immunity. Using our proprietary mRNA therapeutic platform, or MRT platform, we
create mRNA that encodes functional proteins. Our mRNA is designed to be
delivered to the target cell where the cell's own machinery recognizes it and
translates it, restoring or augmenting protein function to treat or prevent
disease. We believe the mRNA design, delivery and manufacturing capabilities of
our MRT platform provide us with the most advanced platform for developing
product candidates that deliver mRNA encoding functional proteins for
therapeutic uses. We believe our MRT platform is broadly applicable across
multiple diseases in which the production of a desirable protein can have a
therapeutic effect. We are primarily focused on applying our MRT platform to
treat pulmonary diseases caused by insufficient protein production or where
production of proteins can modify disease. In addition, we are pursuing
discovery efforts in diseases that affect the liver. We are also pursuing the
applicability of our MRT platform for the development of mRNA vaccines for
infectious diseases under a collaboration with Sanofi Pasteur Inc., or Sanofi,
the vaccine global business unit of Sanofi S.A.
We are developing MRT5005 for the treatment of cystic fibrosis, or CF. We
believe MRT5005 is the first clinical-stage mRNA product candidate designed to
deliver mRNA encoding fully functional cystic fibrosis transmembrane conductance
regulator, or CFTR, protein to the lung. We have designed MRT5005 to be inhaled
via a handheld nebulizer. Once the inhaled MRT5005 has entered the epithelial
cells lining the patient's lungs, our therapeutic mRNA uses the cells' own
machinery for translation and expression of fully functional CFTR protein,
thereby restoring this essential ion channel, which we believe will address the
pathology of CF directly. Currently approved CFTR modulating therapies are
limited to patients with specific genetic mutations; therefore, there remains a
significant unmet medical need for patients with CF who have genetic mutations
non-amenable
to currently approved CFTR modulating therapies. Additionally, patients treated
with these current therapies still suffer from a long-term decline in lung
function and exacerbations that require hospitalization. MRT5005 is being
developed to treat the underlying cause of CF, regardless of the specific
genetic mutation, including in patients with limited or no CFTR protein. The
U.S. Food and Drug Administration, or FDA, has granted orphan drug designation,
fast track designation and rare pediatric disease designation for MRT5005 for
the treatment of CF.
We are conducting a Phase 1/2 clinical trial to evaluate the safety and
tolerability of single- and multiple-ascending doses of MRT5005. The clinical
trial is investigating several groups receiving five once-weekly doses, as well
as a group receiving five daily doses. Percent predicted forced expiratory
volume in one second, or ppFEV
1
, which is a well-defined and accepted endpoint measuring lung function, is also
being measured at
pre-defined
timepoints throughout the trial as a safety measure. Target enrollment for each
dose group consists of four patients total, three patients receiving MRT5005 and
one receiving placebo. In evaluating safety and tolerability, the primary
outcome measure, data to date from the ongoing Phase 1/2 clinical trial
suggested that repeat dosing of MRT5005 was generally safe and well tolerated.
For patients receiving MRT5005, ppFEV
1
was not negatively impacted; there was no pattern of treatment-associated
increases in ppFEV
1
. There was no clinically relevant immunogenicity as measured by anti-CFTR
antibodies,
anti-PEG
antibodies or
T-cell
sensitization to CFTR. Detection of mRNA and lipid in the blood suggests that
MRT5005 crosses the mucus layer, delivering mRNA to the lung of CF patients.

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The clinical trial continues to dose in the remaining dose groups, which include
a 20 mg multiple-ascending dose group and the daily dosing cohorts, and we
anticipate reporting the findings from the clinical trial at a future medical
meeting. We plan to continue with ongoing and additional translational studies
with MRT5005 and a next-generation CF candidate to support and optimize future
clinical development, including research into dosing, formulation and
nebulization. We have a next-generation CF discovery program that incorporates
mRNA codon optimization and advances in lipid nanoparticle, or LNP, chemistry.
Positive preclinical data generated supports planned initiation of
investigational new drug, or IND,-enabling studies in the second half of 2021.
We are leveraging our lung delivery platform and focusing our preclinical
research efforts on identifying lead product candidates in additional pulmonary
diseases with unmet medical need, including primary ciliary dyskinesia,
pulmonary arterial hypertension and respiratory infectious diseases. In
addition, we are pursuing discovery efforts in diseases that affect the liver.
We have also begun to explore ways to apply our mRNA and delivery platform
expertise to diseases where the degradation of a protein would lead to
therapeutic benefit. We believe that using mRNA to enable the production of a
molecule that can help tag a target protein for destruction within the cell may
have advantages over other protein degradation approaches, including the ability
to reach previously undruggable therapeutic targets and increase target
selectivity. Additionally, we are evaluating the potential of delivering mRNA
encoding therapeutic antibodies. We have early discovery efforts ongoing in
these areas.
Additionally, we are leveraging the broad applicability of our platform through
a collaboration with Sanofi to develop infectious disease vaccines using our
mRNA technology. In the case of vaccines, the mRNA instructs certain cells in
the body to produce an antigen that will induce an immune response to an
infectious pathogen. Under the collaboration with Sanofi, we are jointly
conducting research and development activities to advance vaccines targeting up
to seven infectious disease pathogens. As part of the ongoing vaccine
development program, comprehensive
in vivo
studies have been conducted across several infectious disease targets. Multiple
development candidates have been evaluated against distinct pathogens, all of
which were well tolerated across all species tested. Multiple antigens have been
tested with all demonstrating robust neutralization titers. Two of the target
pathogens under development are a novel strain of coronavirus named
SARS-CoV-2,
which causes
COVID-19,
and influenza. After evaluation of multiple
COVID-19
vaccine candidates
in vivo
for immunogenicity and neutralizing antibody activity, MRT5500 was selected as
the lead candidate for a vaccine against
SARS-CoV-2.
In October 2020 and in April 2021, preclinical data was reported demonstrating
that MRT5500 induced potent neutralizing antibodies against
SARS-CoV-2
in mice and
non-human
primates, or NHPs. Two doses of MRT5500 in NHPs induced neutralizing antibody
levels significantly higher than those observed in a panel of samples from
COVID-19
patients. Additionally, MRT5500 demonstrated protection against viral infection
and disease progression in Syrian golden hamsters immunized with MRT5500 against
a virus challenge. It was also demonstrated that MRT5500-immunized mice and NHPs
exhibited a
Th1-biased
T-cell
response against
SARS-CoV-2.
Vaccine-associated enhanced respiratory disease, or VAERD, has generally not
been reported to be associated with a
Th1-biased
T-cell
response and therefore these data suggest the potential for a reduced risk for
VAERD. A Phase 1/2 clinical trial to evaluate MRT5500 began in March 2021 and
interim data from this trial is expected in the third quarter of 2021. For
information on risks related to our successful development of a vaccine against
COVID-19,
please see Part II, Item 1A - "Risk Factors - Risks Related to the
COVID-19
Pandemic," included elsewhere in this Quarterly Report on Form
10-Q.
For the influenza vaccine program, lead LNP/mRNA formulations are being
evaluated in preclinical studies to support a clinical
proof-of-technology
trial anticipated to begin
mid-year
2021. Preclinical studies are ongoing for targets against additional viral and
bacterial pathogens.
Our vision is to continue building a leading mRNA product company, leveraging
our extensive experience with proprietary mRNA product development, delivery,
manufacturing and process development. Our proprietary MRT platform has enabled
us to focus on direct therapeutic approaches to treat specific genetic diseases
with significant unmet medical need. We are primarily focused on applying our
MRT platform to treat pulmonary diseases where the production of proteins can
modify disease. We are also leveraging our platform's broad applicability to
other diseases, including liver diseases, as well as to preventing disease in
the case of infectious disease vaccines. To realize our vision, we plan to
advance multiple programs to clinical stage, add new pipeline programs and
continue to innovate on the mRNA platform. In order to achieve these goals, we
plan to increase our research and development investments, add key
in-house
capabilities, deepen our platform and delivery expertise as well as expand our
infrastructure and facility size. We also plan to appropriately invest in
manufacturing and commercial capabilities to support continued growth and
advancement and our ultimate goal of delivering mRNA medicines to treat or
prevent life-threatening or debilitating illnesses.
The successful development of our product candidates will require, among other
things, our mRNA manufacturing capabilities. To date, we have established
100-gram
single-batch production with our clinical-stage mRNA therapeutics platform.
Build-out
of a dedicated manufacturing space through a contract manufacturing partner was
completed during the third quarter of 2020 and has the potential to accommodate
multiple
250-gram
batches per month upon continued investments and third-party supplier
arrangements. As it relates to development of a
COVID-19
vaccine, depending on the final human
COVID-19
vaccine dose and timing of
scale-up
activities, we estimate that we could have manufacturing capacity to produce
90-360 million
doses annually. We plan to further expand our mRNA manufacturing capabilities to
increase production capacity, and will need to work with raw material and other
third-party suppliers to achieve this goal.

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Since our inception in 2011, we have devoted substantially all of our focus and
financial resources to organizing and staffing our company, business planning,
raising capital, acquiring or discovering product candidates and securing
related intellectual property rights and conducting discovery, research and
development activities for our programs. We do not have any products approved
for sale and have not generated any revenue from product sales. Through
March 31, 2021, we have funded our operations primarily through sales of equity
securities and upfront and milestone payments received under a collaboration and
license agreement with Sanofi and we have received proceeds of approximately
$1.1 billion from such transactions.
We are a party to an Open Market Sale Agreement
SM
, or Sales Agreement, with Jefferies LLC, or Jefferies, under which we may issue
and sell shares of our common stock, from time to time, having an aggregate
offering price of up to $100.0 million. As of March 31, 2021, we have issued and
sold 2,863,163 shares of our common stock pursuant to the Sales Agreement,
resulting in gross proceeds of $37.9 million, before deducting commissions of
$1.1 million and other offering expenses of $0.2 million. There were no shares
issued or sold pursuant to the Sales Agreement during the three months ended
March 31, 2021. In the future, $62.1 million of shares of common stock remain
available to be sold pursuant to the Sales Agreement, which sales, if any, would
be made under our universal shelf registration statement on Form
S-3,
or the 2020 Shelf.
On June 30, 2020, we issued and sold 5,681,819 shares of our common stock
through a public offering under a Registration Statement on Form
S-ASR,
which became automatically effective upon filing on June 24, 2020, at a price
per share of $22.00, resulting in gross proceeds of $125.0 million, before
deducting underwriting discounts and commissions of $7.5 million and other
offering expenses of $0.5 million.
Since our inception, we have incurred significant operating losses. Our ability
to achieve profitability will depend heavily on the successful development and
eventual commercialization of one or more of our current or future product
candidates. As of March 31, 2021, we had an accumulated deficit of
$386.8 million. We expect to continue to incur significant expenses for at least
the next several years as we advance our product candidates from discovery
through preclinical development and clinical trials and seek regulatory
approval. In addition, if we obtain marketing approval for any of our product
candidates, we expect to incur significant commercialization expenses related to
product manufacturing, marketing, sales and distribution. We may also incur
expenses in connection with the
in-licensing
or acquisition of additional product candidates.
As a result, we will need substantial additional funding to support our
continuing operations and pursue our growth strategy. Until such time as we can
generate significant revenue from product sales, if ever, we expect to finance
our operations through the sale of equity, debt financings or other capital
sources, including collaborations, strategic partnerships or marketing,
distribution or licensing arrangements with third parties or grants from
organizations and foundations. We may be unable to raise additional funds or
enter into such other agreements or arrangements when needed on favorable terms,
or at all. If we fail to raise capital or enter into such agreements as, and
when, needed, we may have to significantly delay, scale back or discontinue the
development and commercialization of one or more of our product candidates or
delay our pursuit of potential
in-licenses
or acquisitions.
Because of the numerous risks and uncertainties associated with product
development, we are unable to predict the timing or amount of increased expenses
or when or if we will be able to achieve or maintain profitability. Even if we
are able to generate product sales, we may not become profitable. If we fail to
become profitable or are unable to sustain profitability on a continuing basis,
then we may be unable to continue our operations at planned levels and be forced
to reduce or terminate our operations.
As of March 31, 2021, we had cash, cash equivalents and investments of
$654.8 million. We believe that our existing cash, cash equivalents and
investments will enable us to fund our operating expenses and capital
expenditure requirements through 2023.
Sanofi Pasteur Collaboration and Licensing Agreement
In 2018, we entered into a collaboration and license agreement with Sanofi, or
the Original Sanofi Agreement, to develop mRNA vaccines for up to five
infectious disease pathogens, or the Licensed Fields. On March 26, 2020, we and
Sanofi amended the Original Sanofi Agreement, or the First Sanofi Amendment, to
include vaccines against
SARS-CoV-2
as an additional Licensed Field, increasing the number of infectious disease
pathogens to up to six. On June 22, 2020, we and Sanofi further amended the
Original Sanofi Agreement to expand the scope of the collaboration and licenses
granted to Sanofi, or the Second Sanofi Amendment, which closed on July 20,
2020, the effective date. The Original Sanofi Agreement, as amended by the First
Sanofi Amendment and the Second Sanofi Amendment, is referred to as the Amended
Sanofi Agreement.
Pursuant to the Amended Sanofi Agreement, we and Sanofi are jointly conducting
research and development activities to advance mRNA vaccines targeting up to
seven infectious disease pathogens. The term of the research collaboration
expires in June 2022, with an option for Sanofi to extend for one additional
year. If Sanofi elects to extend the collaboration, the collaboration may be
further expanded to jointly conduct research and development activities to
advance mRNA vaccines for up to an additional three infectious disease
pathogens, bringing the total to up to ten pathogens.

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Under the terms of the Amended Sanofi Agreement, we have granted to Sanofi
exclusive, worldwide licenses under applicable patents, patent applications,
know-how
and materials, including those arising under the collaboration, to develop,
commercialize and manufacture mRNA vaccines to prevent, treat or cure diseases,
disorders or conditions in humans caused by any infectious disease pathogen,
with certain specified exceptions.
Business Impact of the
COVID-19
Pandemic
Since early 2020, the outbreak of the novel strain of coronavirus named
SARS-CoV-2,
which causes
COVID-19,
has spread across the globe and the
COVID-19
pandemic has had wide-reaching impacts on the global economy and business
operations. The
COVID-19
pandemic has had, and we expect it will continue to have, an impact on our
operations, the operations of our collaborators, the operations of third-party
contractors and other entities, with which we interact, as well as on the
patients who may enroll in our clinical trials. We actively continue to monitor
COVID-19
trends and government guidance. The ultimate impacts of the
COVID-19
pandemic are still unknown and uncertain. For additional information on risks
posed by the
COVID-19
pandemic, please see Part II, Item 1A - "Risk Factors - Risks Related to the
COVID-19
Pandemic," included elsewhere in this Quarterly Report on Form
10-Q.
Components of Our Results of Operations
Revenue from Product Sales
To date, we have not generated any revenue from product sales, and we do not
expect to generate any revenue from the sale of products in the near future. If
our development efforts for our product candidates are successful and result in
regulatory approval, we may generate revenue in the future from product sales.
Collaboration Revenue
Since 2018, we have recognized revenue relating to the Amended Sanofi Agreement.
Under revenue recognition guidance, we account for: (i) the license we conveyed
to Sanofi with respect to the Licensed Fields, (ii) the licensed
know-how
to be conveyed to Sanofi with respect to the Licensed Fields, (iii) our
obligations to perform research and development on the Licensed Fields, (iv) our
obligation to transfer licensed materials to Sanofi, (v) our obligation to
manufacture and supply certain
non-clinical
and clinical mRNA vaccines and materials containing mRNA until we transfer such
manufacturing capabilities to Sanofi and (vi) the technology and process
transfer as a single performance obligation. We recognize revenue using the
cost-to-cost
input method, which we believe best depicts the transfer of control to the
customer. Under the
cost-to-cost
input method, the extent of progress towards completion is measured based on the
ratio of actual costs incurred to the total estimated costs expected upon
satisfying the identified performance obligation. Under this method, revenue is
recorded as a percentage of the estimated transaction price based on the extent
of progress towards completion. We recognize adjustments in revenue under the
cumulative
catch-up
method. Under this method, the impact of this adjustment on revenue recorded to
date is recognized in the period the adjustment is identified.
Operating Expenses
Research and Development Expenses
Research and development expenses consist primarily of costs incurred in
connection with the discovery and development of our product candidates. We
expense research and development costs as incurred. These expenses include:

    •     employee-related expenses, including salaries, related benefits and
          stock-based compensation expense for employees engaged in research and
          development functions;



    •     expenses incurred in connection with the preclinical and clinical
          development of our product candidates, including under agreements with
          third parties, such as consultants and contract research organizations,
          or CROs;



    •     the cost of manufacturing drug products for use in our preclinical
          studies and clinical trials, including under agreements with third
          parties, such as consultants and contract manufacturing organizations, or
          CMOs;



  •   laboratory supplies;



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    •     facilities, depreciation and other expenses, which include direct or
          allocated expenses for rent and maintenance of facilities and insurance;



  •   costs to fulfill our obligations under our collaboration with Sanofi;



  •   costs related to compliance with regulatory requirements; and



  •   payments made under third-party licensing agreements.

We recognize external development costs based on an evaluation of the progress to completion of specific tasks using information provided to us by our service providers. Nonrefundable advance payments for goods or services to be received in the future for use in research and development activities are recorded as prepaid expenses. Such amounts are recognized as an expense when the services have been performed or the goods have been delivered, or when it is no longer expected that the goods will be delivered or the services rendered. Upfront payments, milestone payments (other than those deemed contingent consideration in a business combination) and annual maintenance fees under license agreements are expensed in the period in which they are incurred. Our direct research and development expenses are tracked on a program-by-program basis and consist primarily of external costs, such as fees paid to outside consultants, CROs, CMOs and central laboratories in connection with our preclinical development, process development, manufacturing and clinical development activities. Our direct research and development expenses by program also include costs of laboratory supplies incurred for each program as well as fees incurred under license agreements. We do not allocate employee costs or facility expenses, including depreciation or other indirect costs, to specific programs because these costs are deployed across multiple programs and, as such, are not separately classified. We use internal resources primarily to conduct our research and discovery and to manage our preclinical development, process development, manufacturing and clinical development activities. The table below summarizes our direct research and development expenses incurred by program:



                                                  Three Months Ended
                                                       March 31,
                                                   2021          2020
                                                    (in thousands)
Discovery program                               $    8,616     $  3,775
Vaccine program                                      7,570        2,589
MRT5005 program                                      6,214        6,094

Unallocated research and development expenses 18,740 8,981

Total research and development expenses $ 41,140 $ 21,439

Research and development activities are central to our business model. Product candidates in later stages of clinical development generally have higher development costs than those in earlier stages, primarily due to the increased size and duration of later-stage clinical trials. As a result, we expect that our research and development expenses will increase substantially over the next several years as we conduct our clinical trials of MRT5005 for the treatment of patients with CF; expand our manufacturing capabilities; conduct research and development activities to advance mRNA vaccine candidates and develop an mRNA vaccine platform under the Amended Sanofi Agreement; prepare regulatory filings for our product candidates; continue to discover and develop additional product candidates; and potentially advance product candidates from our discovery program into later stages of clinical development. We expect to continue to devote a substantial portion of our resources to our discovery program for the foreseeable future. The successful development and commercialization of our product candidates is highly uncertain. At this time, we cannot reasonably estimate or know the nature, timing and costs of the efforts that will be necessary to complete the preclinical and clinical development of any of our product candidates. This uncertainty is due to the numerous risks and uncertainties associated with product development and commercialization, including the uncertainty of:



    •     the timing and progress of preclinical and clinical development
          activities, including delays resulting from the
          COVID-19
          pandemic;



    •     the number and scope of preclinical and clinical programs we decide to
          pursue;



    •     our ability to maintain our current research and development programs and
          to establish new ones;



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  •   establishing an appropriate safety profile with IND enabling studies;



    •     successful patient enrollment in, and the initiation and completion of,
          clinical trials;



    •     the successful completion of clinical trials with safety, tolerability
          and efficacy profiles that are satisfactory to the FDA or any comparable
          foreign regulatory authority;



  •   the receipt of regulatory approvals from applicable regulatory authorities;



    •     the timing, receipt and terms of any marketing approvals from applicable
          regulatory authorities;



  •   the success of our collaboration with Sanofi;



  •   our ability to establish new licensing or collaboration arrangements;



  •   the performance of our future collaborators, if any;



    •     establishing commercial manufacturing capabilities or making arrangements
          with third-party manufacturers;



    •     development and timely delivery of commercial-grade drug formulations
          that can be used in our clinical trials and for commercial launch;



    •     obtaining, maintaining, defending and enforcing patent claims and other
          intellectual property rights;



    •     launching commercial sales of our product candidates, if approved,
          whether alone or in collaboration with others; and



    •     maintaining a continued acceptable safety profile of the product
          candidates following approval.


Any changes in the outcome of any of these variables with respect to the
development of our product candidates in preclinical and clinical development
could mean a significant change in the costs and timing associated with the
development of these product candidates. If FDA or another regulatory authority
were to delay our planned start of clinical trials or require us to conduct
clinical trials or other testing beyond those that we currently expect, or if we
experience significant delays in enrollment in any of our planned clinical
trials, we could be required to expend significant additional financial
resources and time to complete clinical development of that product candidate.
We may never obtain regulatory approval for any of our product candidates. Drug
commercialization will take several years and millions of dollars in development
costs.
General and Administrative Expenses
General and administrative expenses consist primarily of salaries, related
benefits and stock-based compensation expense for personnel in executive,
finance and administrative functions. General and administrative expenses also
include facilities, depreciation and other expenses, which include direct or
allocated expenses for rent and maintenance of facilities and insurance, as well
as professional fees for legal, patent, consulting, recruiting fees, investor
and public relations, accounting and audit services.
We anticipate that our general and administrative expenses will increase over
the next several years as we anticipate increased accounting, audit, legal,
regulatory, compliance, director and officer insurance and investor and public
relations costs associated with being a public company.
Change in Fair Value of Contingent Consideration
In connection with our acquisition of the messenger RNA therapeutic platform, or
MRT Program, from Shire Human Genetic Therapies, Inc., or Shire, a subsidiary of
Takeda Pharmaceutical Company Ltd., we recognized contingent consideration
liabilities for future potential milestone and earnout payment obligations. The
contingent consideration was initially recorded at fair value on the acquisition
date and is subsequently remeasured to fair value at each reporting date. Any
changes in the fair value of the contingent consideration liabilities are
recognized as operating income or expenses.

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Other Income, Net
Other Income, Net
Other income, net primarily consists of income recognized in connection with our
investments in money market funds, U.S. treasuries and U.S. government agency
bonds.
Income Taxes
We recognized an income tax provision of $0.3 million and $0 during the three
months ended March 31, 2021 and March 31, 2020, respectively. The income tax
provision recognized during the three months ended March 31, 2021 relates
primarily to an expected income tax liability due to the acceleration of revenue
recognition for tax purposes related to the Amended Sanofi Agreement.
As of December 31, 2020, we had U.S. federal net operating loss carryforwards of
$239.3 million, of which $116.1 million will, if not utilized, begin to expire
in 2031. As of December 31, 2020, we had U.S. state net operating loss
carryforwards of $227.6 million, which will, if not utilized, begin to expire in
2031. As of December 31, 2020, we also had U.S. federal and state research and
development tax credit carryforwards of $7.0 million and $4.3 million,
respectively, which will, if not utilized, begin to expire in 2032 and 2028,
respectively, and orphan drug tax credit carryforwards of $17.4 million, which
begin to expire in 2037. We also have state investment tax credit carryforwards
of $0.8 million, which will, if not utilized, begin to expire in 2020. As of
December 31, 2020, we recorded a full valuation allowance against our net
deferred tax assets.
Results of Operations
Comparison of the Three Months Ended March 31, 2021 and 2020
The following table summarizes our results of operations for the
three months ended March 31, 2021 and 2020:

                                                        Three Months Ended
                                                             March 31,
                                                       2021            2020           Change
                                                                  (in thousands)
Collaboration revenue                                $  34,600       $   4,654       $  29,946
Operating expenses:
Research and development                                41,140          21,439          19,701
General and administrative                              10,817           7,458           3,359

Change in fair value of contingent consideration (43,979 ) (9,452 ) (34,527 )



Total operating expenses                                 7,978          19,445         (11,467 )

Income (loss) from operations                           26,622         (14,791 )        41,413
Other income, net                                          154             509            (355 )

Income (loss) before income tax provision               26,776         (14,282 )        41,058
Income tax provision                                      (254 )            -             (254 )

Net income (loss)                                    $  26,522       $ (14,282 )     $  40,804

Collaboration Revenue Collaboration revenue was $34.6 million and $4.7 million for the three months ended March 31, 2021 and 2020, respectively, which was derived from the Sanofi collaboration. Revenue is recorded as a percentage of the estimated transaction price based on the extent of progress towards completion. Activities for the vaccine program increased in the three months ended March 31, 2021 compared to the same period in 2020, resulting in a larger percent of the transaction price recognized. See "-Components of Our Results of Operations - Collaboration Revenue" above.



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Research and Development Expenses

                                                             Three Months Ended
                                                                 March 31,
                                                             2021           2020         Change
                                                                      (in thousands)

Direct external research and development expenses by program: Discovery program

$    8,616      $  3,775      $  4,841
Vaccine program                                                7,570         2,589         4,981
MRT5005 program                                                6,214         6,094           120

Unallocated research and development expenses: Personnel related (including stock-based compensation) 8,757 5,985 2,772 Other

                                                          9,983         2,996         6,987

Total research and development expenses                   $   41,140      $ 21,439      $ 19,701



Research and development expenses were $41.1 million for the three months ended
March 31, 2021, compared to $21.4 million for the three months ended March 31,
2020. The increase of $19.7 million was primarily due to continued development
of our discovery program and our vaccine program associated with the Sanofi
collaboration as well as increases in occupancy and personnel-related costs.
Direct external expenses of our discovery program increased by $4.8 million
during the three months ended March 31, 2021 compared to the three months ended
March 31, 2020 primarily due to increased costs related to our ongoing
exploratory research and discovery efforts to identify next-generation CF
candidates and identify lead product candidates in additional pulmonary
diseases.
Direct external expenses of our vaccine program increased by $5.0 million during
the three months ended March 31, 2021 compared to the three months ended
March 31, 2020 primarily due to increased activities with the Sanofi
collaboration.
Direct external expenses of our MRT5005 program increased by $0.1 million during
the three months ended March 31, 2021 compared to the three months ended
March 31, 2020 primarily due to increased clinical trial costs offset by
decreased manufacturing costs.
Unallocated research and development expenses increased by $9.8 million during
the three months ended March 31, 2021 compared to the three months ended
March 31, 2020. The increase of $2.8 million in personnel-related costs was
primarily related to an increase in headcount in the three months ended
March 31, 2021 compared to the same period in 2020 as well as an increase in
stock-based compensation. The increase of $7.0 million in other unallocated
research and development expenses was due to an increase of $4.3 million in
occupancy costs and an increase of $1.6 million in amortization expense related
to the definite-lived MRT intangible asset.
General and Administrative Expenses
General and administrative expenses were $10.8 million for the three months
ended March 31, 2021, compared to $7.5 million for the three months ended
March 31, 2020. The increase of $3.4 million was primarily due to an increase of
$2.5 million in professional fees primarily consisting of increases in
recruiting fees, consulting costs and legal fees primarily associated with
filing patent applications and prosecuting our intellectual property portfolio.
Additionally, personnel-related costs increased by $0.8 million primarily
related to an increase in headcount in the three months ended March 31, 2021
compared to the same period in 2020 as well as an increase in stock-based
compensation.
Change in Fair Value of Contingent Consideration
During the three months ended March 31, 2021 and 2020, we recognized operating
income of $44.0 million and $9.5 million, respectively, for changes in the fair
value of the contingent consideration liabilities we recorded in connection with
our acquisition of the MRT Program in December 2016. The contingent
consideration liabilities relate to future potential milestone and earnout
payment obligations. The income recognized during the three months ended
March 31, 2021 was attributed primarily to a decrease in the fair value of the
contingent consideration liability for future earnout payments that could become
due. During the quarter ended March 31, 2021, we released results of the second
interim data analysis from the Phase 1/2 clinical trial of MRT5005. Following
this release, we reassessed the clinical development plan for MRT5005 and
adjusted the expected timelines and the probability of achieving specified
events for the program, which resulted in a decrease in the fair value of
contingent consideration during the three months ended March 31, 2021.

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Income Taxes
We recognized an income tax provision of $0.3 million and $0 during the three
months ended March 31, 2021 and 2020, respectively. The income tax provision
recognized during the three months ended March 31, 2021 relates primarily to an
expected income tax liability due to the acceleration of revenue recognition for
tax purposes related to the Amended Sanofi Agreement.
Liquidity and Capital Resources
Since our inception through March 31, 2021, we have not generated any revenue
from product sales, have generated collaboration revenue only from the Amended
Sanofi Agreement and have incurred significant operating losses and negative
cash flows from our operations. We have not yet commercialized any of our
product candidates, and we do not expect to generate revenue from sales of any
product candidates for several years, if at all. See "-Funding Requirements" and
Note 1 to the condensed consolidated financial statements in Part I, Item 1 of
this Quarterly Report on Form
10-Q
for a further discussion of our liquidity.
Through March 31, 2021, we have funded our operations primarily through sales of
equity securities and upfront and milestone payments received under the Amended
Sanofi Agreement and we have received proceeds of approximately $1.1 billion
from such transactions.
We are party to the Sales Agreement, with Jefferies, under which we may issue
and sell shares of our common stock, from time to time, having an aggregate
offering price of up to $100.0 million. Sales of common stock through Jefferies
may be made by any method that is deemed an "at the market" offering as defined
in Rule 415 promulgated under the Securities Act of 1933, as amended. Jefferies
has agreed to use its commercially reasonable efforts consistent with its normal
trading and sales practices to sell shares of our common stock based upon our
instructions. We are not obligated to make any sales of our common stock under
the Sales Agreement. As of March 31, 2021, we have issued and sold 2,863,163
shares of our common stock, resulting in gross proceeds of $37.9 million, before
deducting commissions of $1.1 million and other offering expenses of
$0.2 million. There were no shares issued or sold pursuant to the Sales
Agreement during the three months ended March 31, 2021. In the future,
$62.1 million of shares of common stock remain available to be sold pursuant to
the Sales Agreement, which sales, if any, would be made under the 2020 Shelf.
On June 24, 2020, we filed a registration statement on Form
S-3ASR,
which became automatically effective upon filing with the SEC (File
No. 333-239405),
referred to as the June 2020 Registration Statement. The June 2020 Registration
Statement registered for sale from time to time common stock, preferred stock,
debt securities, warrants and/or units in one or more offerings. On June 30,
2020, we issued and sold 5,681,819 shares of common stock and a stockholder sold
6,824,992 shares of common stock through a public offering pursuant to the June
2020 Registration Statement. The price to the public was $22.00 per share,
resulting in gross proceeds to us of $125.0 million, before deducting
underwriting discounts and commissions of $7.5 million and other offering
expenses of $0.5 million. We did not receive any proceeds from the sales of
shares of common stock by the stockholder.
Cash Flows
The following table summarizes our sources and uses of cash for each of the
periods presented:

                                                                 Three Months Ended
                                                                     March 31,
                                                                2021            2020
                                                                   (in thousands)

Net cash provided by (used in) operating activities $ 689 $ (31,447 ) Net cash provided by (used in) investing activities

            (188,520 )        44,260
Net cash provided by financing activities                         1,550              75

Net increase (decrease) in cash, cash equivalents and
restricted cash                                              $ (186,281 )     $  12,888



Operating Activities
During the three months ended March 31, 2021, operating activities provided
$0.7 million of cash, resulting from our net income of $26.5 million and net
cash provided by changes in our operating assets and liabilities of
$11.3 million, partially offset by net
non-cash
income of $37.2 million. Net cash provided by changes in our operating assets
and liabilities consisted of an $8.1 million increase in accounts payable, a
$3.4 million decrease in collaboration receivables, a $3.0 million increase in
deferred revenue, a $3.0 million decrease in
right-of-use
assets and a $2.7 million increase in accrued expenses, partially offset by a
$4.7 million increase in prepaid expenses and other assets, a $3.2 million
decrease in lease liability and a $1.3 million increase in long-term prepaid
rent. Net
non-cash
charges for the three months ended March 31, 2021 primarily consisted of a
$44.0 million decrease in the change in the fair value of contingent
consideration, partially offset by a $4.0 million charge to stock-based
compensation expense and a $2.8 million charge for depreciation and amortization
expense.

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During the three months ended March 31, 2020, operating activities used
$31.4 million of cash, resulting from our net loss of $14.3 million, net cash
used in changes in our operating assets and liabilities of $12.2 million and
net non-cash income
of $4.9 million. Net cash used in changes in our operating assets and
liabilities consisted of a $9.5 million decrease in accounts payable, a $3.0
million increase in long-term prepaid rent, a $1.3 million decrease in deferred
revenue and a $1.6 million increase in short-term collaboration receivables,
partially offset by a $2.6 million decrease in prepaid expenses and other assets
and a $0.6 million increase in accrued expenses.
Net non-cash income
for the three months ended March 31, 2020 primarily consisted of a $9.5 million
decrease in the change in the fair value of contingent consideration which was
primarily due to an increase in the discount rate, partially offset by an
increase in the fair value due to the continued progress of the MRT5005 program
and the time value of money due to the passage of time.
Investing Activities
During the three months ended March 31, 2021, net cash used in investing
activities was $188.5 million, consisting of $186.9 million of purchases of i
nvestments and $1.6 m
illion of purchases of property and equipment.
During the three months ended March 31, 2020, net cash provided by investing
activities was $44.3 million, consisting of $74.0 million of sales and
maturities of investments, partially offset by $27.4 million of purchases of
investments and $2.3 million of purchases of property and equipment.
Financing Activities
During the three months ended March 31, 2021, net cash provided by financing
activities was $1.6 million, consisting solely of proceeds from option
exercises.
During the three months ended March 31, 2020, net cash provided by financing
activities was $0.1 million, consisting solely of proceeds from option
exercises.
Funding Requirements
We expect our expenses to increase in connection with our ongoing activities,
particularly as we continue the research and development of, continue ongoing
and initiate new clinical trials of and seek marketing approval for our product
candidates. In addition, we expect to incur additional costs associated with
operating as a public company. Our expenses will also increase if, and as, we:

  •   continue the clinical development of MRT5005;



    •     continue the development of mRNA vaccine candidates against infectious
          diseases, including MRT5500, the lead vaccine candidate against
          SARS-CoV-2;



    •     leverage our programs to advance our other product candidates into
          preclinical and clinical development;



    •     seek regulatory approvals for any product candidates that successfully
          complete clinical trials;



  •   seek to discover and develop additional product candidates;



  •   expand our manufacturing, operational, financial and management systems;



    •     increase personnel, including personnel to support our clinical
          development, manufacturing and commercialization efforts and our
          operations as a public company;



  •   maintain, expand and protect our intellectual property portfolio;



  •   acquire or
      in-license
      other product candidates and technologies;



    •     incur additional legal, accounting and other expenses in operating as a
          public company; and



    •     establish a sales, marketing, medical affairs and distribution
          infrastructure to commercialize any product candidates for which we may
          not obtain marketing approval and intend to commercialize on our own or
          jointly.



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Table of Contents We believe that our existing cash, cash equivalents and investments of $654.8 million as of March 31, 2021 will enable us to fund our operating expenses and capital expenditure requirements through 2023. We have based this estimate on assumptions that may prove to be wrong, and we could exhaust our available capital resources sooner than we expect. We will need to raise additional capital or incur indebtedness to continue to fund our operations in the future. Our ability to raise additional funds will depend on financial, economic and market conditions, many of which are outside of our control, and we may be unable to raise financing when needed, or on terms favorable to us. If we are unable to raise additional funds when needed, we may be required to delay, reduce or eliminate our product development or future commercialization efforts, or grant rights to develop and market product candidates that we would otherwise prefer to develop and market ourselves, which could adversely affect our business prospects, and we may be unable to continue our operations. Because of numerous risks and uncertainties associated with research, development and commercialization of product candidates, we are unable to estimate the exact amount of our working capital requirements. Factors that may affect our planned future capital requirements and accelerate our need for additional working capital include the following:

• the impacts of the


      COVID-19
      pandemic and our response to it;



    •     the scope, progress, results and costs of researching and developing our
          product candidates, and conducting preclinical studies and clinical
          trials;



  •   the success of our collaboration with Sanofi;



    •     the costs, timing and outcome of regulatory review of our product
          candidates;



    •     the costs of future activities, including product sales, medical affairs,
          marketing, manufacturing and distribution, for any of our product
          candidates for which we receive marketing approval;



    •     the costs of manufacturing commercial-grade products and sufficient
          inventory to support commercial launch;


• the ability to receive additional


      non-dilutive
      funding, including grants from organizations and foundations;



    •     the revenue, if any, received from commercial sale of our products,
          should any of our product candidates receive marketing approval;



  •   the cost and timing of hiring new employees to support our continued growth;



    •     the costs of preparing, filing and prosecuting patent applications,
          maintaining and enforcing our intellectual property rights and defending
          intellectual property-related claims;



    •     the ability to establish and maintain collaborations on favorable terms,
          if at all;


• the extent to which we acquire or


      in-license
      other product candidates and technologies; and



    •     the timing, receipt and amount of sales of, or milestone payments related
          to or royalties on, our current or future product candidates, if any.

A change in the outcome of any of these or other variables with respect to the development of any of our product candidates could significantly change the costs and timing associated with the development of that product candidate. Further, our operating plans may change in the future, and we may need additional funds to meet operational needs and capital requirements associated with such operating plans.



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Until such time, if ever, as we can generate substantial product revenue, we
expect to finance our cash needs through a combination of public or private
equity offerings, debt financings, collaborations, strategic partnerships or
marketing, distribution or licensing arrangements with third parties and grants
from organizations and foundations. To the extent that we raise additional
capital through the sale of equity or convertible debt securities, the ownership
interests of our common stockholders may be materially diluted, and the terms of
such securities could include liquidation or other preferences that could
adversely affect the rights of our common stockholders. Debt financing and
preferred equity financing, if available, may involve agreements that include
restrictive covenants that limit our ability to take specified actions, such as
incurring additional debt, making capital expenditures or declaring dividends.
In addition, debt financing would result in increased fixed payment obligations.
If we raise funds through collaborations, strategic partnerships or marketing,
distribution or licensing arrangements with third parties, we may have to
relinquish valuable rights to our technologies, future revenue streams, research
programs or product candidates or grant licenses on terms that may not be
favorable to us.
Cash Requirements from Contractual and Other Obligations
During the three months ended March 31, 2021, there were no material changes to
our cash requirements from contractual and other obligations as of December 31,
2020 described under Management's Discussion and Analysis of Financial Condition
and Results of Operations in our 2020 Annual Report.
In April 2021, we entered into a contract with The Richmond Group, Inc. for
$36.8 million for the
build-out
of the 200 West Street location in Waltham, Massachusetts. Under the lease
agreement for the 200 West Street location, our landlord will reimburse us
$26.3 million for tenant improvement allowances. We expect to spend between
$10.5 million and $12.5 million towards
build-out
costs, which represents the cost of the project that exceeds the tenant
improvement allowances.
Critical Accounting Policies and Significant Judgments and Estimates
Our condensed consolidated financial statements are prepared in accordance with
generally accepted accounting principles in the United States. The preparation
of our condensed consolidated financial statements and related disclosures
requires us to make estimates and judgments that affect the reported amounts of
assets, liabilities, revenues and expenses, and the disclosure of contingent
assets and liabilities in our finance statements. We believe that several
accounting policies are important to understanding our historical and future
performance. We refer to these policies as critical because these specific areas
generally require us to make judgments and estimates about matters that are
uncertain at the time we make the estimate, and different estimates-which also
would have been reasonable-could have been used. On an ongoing basis, we
evaluate our estimates and judgments. We base our estimates on historical
experience, known trends and events and various other factors that we believe
are reasonable under the circumstances, the results of which form the basis for
making judgments about the carrying values of assets and liabilities that are
not readily apparent from other sources. Our actual results may differ from
these estimates under different assumptions or conditions.
There have been no material changes to our critical accounting policies from
those described in "Management's Discussion and Analysis of Financial Condition
and Results of Operations" in our 2020 Annual Report.

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